Free-electron radiation results from the interaction between swift electrons and local electromagnetic environment. Recent advances in material technologies provide powerful tools to control light emission free may facilitate many intriguing applications of free-electron particle detections, lasers, quantum information processing, etc. Here, we a brief overview on recent theoretical development...

We present an introduction to the operating principles of free-electron lasers, discussing the amplification process, and the requirements on the electron beam necessary to achieve desired performance. INTRODUCTION In the storage rings of synchrotron radiation facilities, the electrons are radiating incoherently [1,2]. Since there is no multi-particle coherence, the radiated intensity is linear...